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Oblique-light illumination

Illumination of a document surface at a very low angle (5-20 degrees) to create disproportionately long shadows from surface irregularities, revealing mechanical erasure disruption, indented writing, and correction-tape edges.

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Related terms

ENFSI Document and Handwriting Working GroupFoster+Freeman VSC8000IR-cut filterIR luminescenceIR transmissionOptical brightening agent (OBA)Transmitted-light examinationVideo Spectral Comparator (VSC)Watermark

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